STUDY ON FLOOD FLOWS AND BED VARIATION IN THE UPSTREAM AND DOWNSTREAM OF THE DIVERSION CHANNEL IN THE HII RIVER

DOI

Bibliographic Information

Other Title
  • 斐伊川放水路への洪水分派に伴う分派点付近の本川河床変動に関する研究

Description

<p>The Hii river diversion channel was constructed in 2013 to decrease the flood discharge flowing to the lower Hii River. The Hii River has almost uniform sand particles whose diameter is 2mm. It is important for the river management to understand effects of the Hii River’s bed variation near the diversion channel on the discharge diverted. The Hii River is known as a representative river having large sand waves formed on braided bars. The flow resistance of the Hii River changes in the peculiar manner with the variation in bed elevation during a flood. In this paper, we conducted two-step analyses (quasi-steady and unsteady flow) to evaluate flow resistances due to the sand waves during 2013 flood by using the general BVC method. The analysis results could reproduce the observed discharge hydrographs and bed variations. We found that mechanism of sand wave deformations could be explained by the proper estimation of temporal variations in Manning’s roughness coefficient by the general BVC method.</p>

Journal

Keywords

Details 詳細情報について

  • CRID
    1390858553269427328
  • DOI
    10.11532/river.20.0_247
  • ISSN
    24366714
  • Text Lang
    ja
  • Data Source
    • JaLC
  • Abstract License Flag
    Allowed

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